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Stephen Porphyrogometus

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Stephen Porphyrogometus (d. 893) was the Patriarch of Constantinople from 886-893. He was a son of Byzantine Emperor Basil I and the youngest brother of Emperor Leo VI.

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Quadratic formula

... a being non-zero. These solutions are also called the roots of the equation. The formula reads <math> x=\frac{-b \pm \sqrt {b^2-4ac}}{2a} </math> The ...